Actor William Baldwin has launched a stinging attack on his younger brother Stephen’s opposition to equal rights for same-sex couples, femalefirst.co.uk reports.

Usual Suspects star Stephen, 41, is the only Republican member of the famous family. Eldest brother, Democrat Alec, has attempted to change Stephen’s mind in the past, and he now has 44-year-old William on his back.

William — who dates a transsexual onscreen in TV show Dirty Sexy Money — tells Out.com of a recent row between the pair: “I asked him, ‘Do you think a gay couple should be married?’ ... (He responds) ‘Because God said and the Bible says that marriage is an institution that exists solely between a man and a woman, blah, blah, blah,’ and he falls behind that crap.